[REBOL] Re: index? none
From: carl:cybercraft at: 29-Nov-2002 9:16
On 29-Nov-02, Ted Landis wrote:
> Hi
> How do I best avoid the error possible in the following:
> index? find block x
> When x is not in block it returns none and index? returns an error.
Hi Ted,
Here's one way...
>> block: ["a" "b" "c"]
== ["a" "b" "c"]
>> if block? blk: find block "b" [index? blk]
== 2
>> if block? blk: find block "d" [index? blk]
== none
or if you want a number returned instead of a none you could use...
>> either block? blk: find block "d" [index? blk][0]
== 0
Hope that helps.
--
Carl Read
